John fielding



No. 624,435. Patented May 2, I899. J. FIELDING.

RIVETING ENGINE.

(Application filed Jan. 19, 1899.)

(No Model.)

lzi'fi asses UNITED STATES PATENT OFFICE.

JOHN FIELDING, OF BELMONT, UPTON ST. LEONARDS, ENGLAND.

RIVETING-ENGINE.

SPECIFICATION formingpart of Letters Patent No. 624,435, dated May' 2,1899.

Application filed January 19, 1399. SerialNo. 702,683. (No model.)

To all whom, it ntay concern.-

Be it known that 1, JOHN FIELDING, a citizen of England, residing atBelmont, Upton St. Leonards, in the county of Gloucester, England, haveinvented a certain new and useful Improved Riveting-Engine, (for which Ihave applied for a patent in Great Britain, dated December 6, 1898, No.25,669,) of which the following is a specification.

My invention relates to a riveting-machine worked by steam, compressedair, or other elastic fluid and so constructed that the rivet issubjected to direct'pressure, while it is also subject to percussion, asI shall describe, referring to the accompanying drawings.

Figure 1 is a longitudinal section, partly in elevation, of ariveting-machine according to my invention. Fig. 2 is a transversesection on the line as a: of Fig. 1. Fig. 3 is a section of acontrolling-valve that may be used.

The body a of the machine, which carries the holding-back tool, has acylindrical part occupied by a spring I) and has attached to it acylinder 0, in which works a hollow piston d, carrying at its end theriveting-tool e. The piston dis bored toreceive a percussion-plunger f,which has its front striking part a little smaller in diameter than itsrear part and has between these parts a recess 8, into which open portsg, formed in the wall of the piston d and communicating by channels hand '5 with the opening j for inlet and outlet of the working fluid. 7Other channels m, formed in the wall of the piston 01, connect ports isand 1, opening into the interior of the piston d. The admission andemission of the working fluid is determined by a three-way cockn. 0 is aport opening to the outer air from the space in front of the percussiveplunger f, and ports 19 open from the interior of the pisston d to anannular space g, which communicates with the outer air by a port 1'.

The machine works as follows: The plates to be riveted being placed withthe rivet inserted in front of the'tool e, the cock at is turned to theposition shown in Fig. 1, admitting the working fluid, which, acting onthe piston d, drives it forward, pressing the riveting-tool on the endof the rivet. At the same time the fluid passes by the channels '5 h gto the recess .9 and pressing on the annular shoulder of the larger partof the plunger f forces the plunger back until this shoulder passes theports 70, whereupon fluid passes by the channels m to the ports Z andthrough them into the space behind the plunger f, forcing it forward, sothat its front end strikes the riveting-tool. When the rear end of f in.its forward stroke passes the ports 19, the fluid behindit escapes asexhaust, and the plunger f is again driven back to be again pressedforward, so that it makes rapidly repeated strokes upon the stem of thetool e, which is at the same time pressed upon the rivet by thefluid-pressure acting on the rear of the piston d. When the plug of thecook 12 is turned one-quarter around, the fluid is allowed to escape bythe lateral opening, and the spring I) pushes the piston (1 back intoposition for a succeeding operation.

Instead of the three-Way cock 'n a valve such as that shown in Fig. 3may be employed to determine the admission and emission of the workingfluid. On pressing the springlever 25 the tubular stem to is pressedagainst the conical end of the stem of the valve '0, which closes themouth of u, and by further pressure the valve U is moved from its seat,admitting working fluid to the machine. On relieving the pressure on tthe valve 0 closes and the stem u retreats, so that its mouth is leftopen, whereupon the Working fluid passes through the bore of u andescapes by lateral apertures w.

Having thus described and ascertained the nature of this invention andthe best means I know of carrying the same into practical effect, Iclaim- A riveting-machine comprising a cylinder fitted with a hollowpressing-piston which carries the riveting-tool, and has within it apercussive plunger, the cylinder and pressingpiston being provided withports and channels for passage of the operating fluid, and aretracting-spring for the hollow piston, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

J Ol'IN FIELDIN G.

Witnesses:

OLIVER IMRAY, GERALD. L. SMITH.

